CN104239254A - Serial asynchronous communication data transmission method - Google Patents
Serial asynchronous communication data transmission method Download PDFInfo
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- CN104239254A CN104239254A CN201410446457.5A CN201410446457A CN104239254A CN 104239254 A CN104239254 A CN 104239254A CN 201410446457 A CN201410446457 A CN 201410446457A CN 104239254 A CN104239254 A CN 104239254A
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Abstract
The invention discloses a serial asynchronous communication data transmission method, and aims to provide a method which is intuitive and simple in structural model, short in design flow, distinct in procedure level and high in reliability, and can ensure the instantaneity of communication transmission data on communication time series and data frame formats. The serial asynchronous communication data transmission method is implemented through the following technical scheme and comprises the steps of adopting an upper computer micro-control chip as an upper computer for asynchronous serial communication, adopting a lower computer micro-control chip as a lower computer for asynchronous serial communication, and connecting the upper computer and the lower computer through a TTL (Transistor-Transistor Logic)/serial signal conversion circuit to form a serial asynchronous communication data transmission device; arranging serial asynchronous communication data transmission program software formed by a serial data receiving processing module, a serial data transmission module and a timer T module in the upper computer micro-control chip and the lower computer micro-control chip; transmitting serial data frame information to transmit buffers of the upper computer and the lower computer in a time-division way; assigning the real data frame to a buffer array Ai through a receive buffer; storing an array word string consistent to a communication frame protocol into a buffer array Bi.
Description
Technical field
The invention relates to electronic system serial asynchronous communication adopts complex technique to realize the method for serial asynchronous communication data transmission.
Background technology
In electronic system, the computing machine microcontroller chip (single-chip microcomputer or DSP) between each parts all needs to carry out exchanges data and sets up communication contact, uses serial communication means to be wherein a kind of important, conventional communication modes.Serial communication working method is divided into the method for synchronization and asynchronous system two kinds, and in real work, asynchronous system is with the most use, comprises three conventional bus standards: RS-232, RS-422, RS-485.Serial transmission refers to the mode that the binary code of data transmits by turn in chronological order on a physical channel in units of position.During serial transmission, transmitting terminal sends by turn, and receiving end accepts by turn, also will confirm accepted character meanwhile, and receiving-transmitting sides will take synchronisation measures (namely judge when have data, what data are, when terminate transmission).Bit is divided into group and transmits by asynchronous transmission, and group can be 1 character or longer of 8.Transmit leg can send these bit groups at any time, and take over party is from not knowing when they can arrive.There is a potential problem in asynchronous transmission, i.e. take over party do not know when data can arrive, and causes data information transfer, uses time delay.
In electronic system, the communication link electromagnetic environment at asynchronous serial communication place is quite severe, and the distance of the transmission data transmitted in serial communication that may cause different in size occur extremely, namely occurring misdata.At present, in serial asynchronous communication, parity bit verifies, cumulative sum verification to ensure to use the method for correct data generally all only to take, or the method that both combine, but all can not fundamentally solve in communication the problem preventing mistake in data, occur misdata once at communication link, when computing machine makes resolution according to misdata, the real-time of electronic system, reliability will inevitably be had a strong impact on, do not reach its work object.
Summary of the invention
The object of the invention is for electronic system computing machine, the weak point of serial communication real-time property, correctness method can not be ensured in existing asynchronous serial communication data transmission, there is provided a kind of tactic pattern intuitively simple, design cycle is short, program is well arranged, easily comprehensive, reliability is high, can ensure the method for communication data transmission real-time, correctness on communication succession, data frame format.
In order to achieve the above object, a kind of serial asynchronous communication data transmission method provided by the invention, it is characterized in that comprising the steps: a kind of serial asynchronous communication data transmission method, it is characterized in that comprising the steps: the host computer using host computer microcontroller chip as asynchronous serial communication, using slave computer microcontroller chip as the slave computer of asynchronous serial communication, the two RS-232/RS-422/RS485 interface by standard and TTL/ rs 232 serial interface signal change-over circuit connect to form serial asynchronous communication data transmission device, serial data receiving processing module is provided with in host computer and slave computer microcontroller chip, the serial asynchronous communication data distributing program software of serial data sending module and timer T module composition, in the transmission of serial asynchronous communication data, host computer, slave computer periodic duty moment point, all with pair time rising edge of a pulse moment point for benchmark, serial asynchronous communication data distributing program software is according to workflow demand, buffer zone time-sharing send serial data frame information is sent to host computer and slave computer, slave computer and host computer is issued by TTL/ rs 232 serial interface signal modular converter, after host computer and slave computer reception buffer zone receive serial data frame information, serial data receiving processing module judges that whether the serial data frame information that host computer and slave computer reception buffer zone receive is effective, reception buffer zone assignment will be passed through to buffer memory array Ai for genuine Frame, buffer memory array Ai subscript variable Ni is from adding 1, the array word string consistent with communication frame agreement stored in buffer memory array Bi.
The present invention has following beneficial effect compared to prior art.
Tactic pattern is intuitively simple, and design cycle is short.The present invention is using host computer microcontroller chip as the host computer of asynchronous serial communication, using slave computer microcontroller chip as the slave computer of asynchronous serial communication, the two RS-232/RS-422/RS485 interface by standard and TTL/ rs 232 serial interface signal change-over circuit connect to form serial asynchronous communication data transmission device, tactic pattern is intuitively simple, and design cycle is short.
Program is well arranged, easily comprehensively.The present invention is provided with serial data receiving processing module in host computer and slave computer microcontroller chip, data transmission blocks and timer T module composition serial asynchronous communication data distributing program software, serial asynchronous communication data distributing program software is according to workflow demand, buffer zone time-sharing send serial data frame information is sent to host computer and slave computer, slave computer and host computer is issued by TTL/ rs 232 serial interface signal modular converter, after host computer and slave computer reception buffer zone receive serial data frame information, serial data receiving processing module judges that whether the serial data frame information that host computer and slave computer reception buffer zone receive is effective, program is well arranged, easily comprehensive.
Reliability is high, can ensure communication data transmission real-time, correctness on communication succession, data frame format.The present invention is in the transmission of serial asynchronous communication data, host computer, slave computer periodic duty moment point all with pair time rising edge of a pulse moment point for benchmark, according to workflow demand time-sharing send, receiving data information, adopt buffer memory array Ai, Bi Double buffer storing data information, improve real-time, correctness, the reliability of transmitting data between computing machine.Even if when there is misdata under communication link abnormal conditions, ensure that communication data transmission data Computer adopts correct data, institute's usage data time delay is the shortest, improve the accuracy in the transmission of asynchronous serial communication data and real-time, decrease the time delay of communication data transmission, guarantee the high reliability of electronic system Computer work, stability.
Accompanying drawing explanation
Figure below further illustrates the present invention in conjunction with the accompanying drawings and embodiments, but does not therefore limit the present invention among affiliated scope of embodiments.
Fig. 1 is the schematic diagram of serial asynchronous communication data transmission device of the present invention.
Fig. 2 is the theory diagram of the serial asynchronous communication reception data of Fig. 1.
Fig. 3 is that serial ports of the present invention receives and sends data time sequence figure.
Fig. 4 is serial asynchronous communication serial data receiving processing module program circuit of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.Wherein, accompanying drawing forms the application's part, and is used from elaboration principle of the present invention in embodiments of the invention one.
Consult Fig. 1.In embodiment described below, realize the device of serial asynchronous communication data transmission, comprise, using host computer microcontroller chip as the host computer of asynchronous serial communication, using slave computer microcontroller chip as the slave computer of asynchronous serial communication, host computer microcontroller chip and host computer microcontroller chip are computing machine microcontroller chip, the two RS-232/RS-422/RS485 interface by standard and TTL/ rs 232 serial interface signal change-over circuit connect to form serial asynchronous communication data transmission device, host computer microcontroller chip is by the cable of pulse when TTL/ rs 232 serial interface signal change-over circuit and transmission pair, to pulse during the transmission pair of slave computer microcontroller chip.Host computer microcontroller chip and slave computer microcontroller chip all have serial asynchronous communication data transmit-receive function.The serial asynchronous communication data distributing program software of serial data receiving processing module, data transmission blocks and timer T module composition is provided with in host computer and slave computer microcontroller chip, in the transmission of serial asynchronous communication data, host computer, slave computer periodic duty moment point, all with pair time rising edge of a pulse moment point for benchmark, serial asynchronous communication data distributing program software is according to workflow demand, buffer zone time-sharing send serial data frame information is sent to host computer and slave computer, slave computer and host computer is issued by TTL/ rs 232 serial interface signal modular converter, after host computer and slave computer reception buffer zone receive serial data frame information, serial data receiving processing module judges that whether the serial data frame information that host computer and slave computer reception buffer zone receive is effective.
Consult Fig. 2, Fig. 3.In the serial asynchronous communication data transmission device that host computer and slave computer are connected to form by RS-232/RS-422/RS485 interface and the TTL/ rs 232 serial interface signal change-over circuit of standard, during host computer pair pulse generation module produce a fixed cycle be Time hardware pulse signal as pair time signal, pulse receiving processing module when passing to slave computer microcontroller chip pair.According to electronic system workflow, the communication frame agreement formulated between host computer, slave computer (comprises baud rate, frame head, frame number, School Affairs, postamble and data block etc.), select the hardware pulse signal of a fixed cycle Time as pair time signal, agreement host computer microcontroller chip, slave computer microcontroller chip periodicity operation time point all with pair time rising edge of a pulse moment point for benchmark, and according to workflow demand time-sharing send data, send serial data moment point respectively at moment interval Time1 ~ Time2, Time3 ~ Time4 transmission serial data; Host computer microcontroller chip by pair time pulse generation module to send pair to slave computer time pulse, and sending serial data frame at interval Time1 ~ Time2 of above-mentioned moment, slave computer data transmission blocks sends serial data frame according to interval Time3 ~ Time4 of above-mentioned moment; Host computer and slave computer are according to the largest interval time between transmission data frame data two data, determine to receive separately the largest interval time of continuous 2 Frames in communication data frame, as timer T1, T2 timing Ti1, Ti2 (Ti1, Ti2 generally get Time/2) of host computer and slave computer; After reception buffer zone in serial data receiver module receives data, serial data receiving processing module program starts.
Consult Fig. 4.A. each serial data receiving processing module initialization serial ports, arranges baud rate, timer Ti etc.;
B., after serial data receiving processing module reception buffer zone receives data, judge that whether these data are effective, effectively then perform step C; Otherwise perform step B;
C. serial data receiving processing module arranges timer T, timing Ti, opens timer T and starts timing;
D. serial data receiving processing module judges whether timer T timing time arrives, if very, the serial data time-out received is described, does not meet workflow agreement, then perform step e, otherwise perform step F;
E. serial data receiving processing module arranges timer T timing Ti, and buffer memory array Ai subscript variable Ni resets, and performs step F;
F. serial data receiving processing module judges whether Frame frame head mark Fi is true, is very then perform G step; Otherwise perform J step;
G. reception buffer zone data assignment is added 1 to serial data receiving processing module buffer memory array Ai, buffer memory array Ai subscript variable Ni by serial data receiving processing module certainly;
H. serial data receiving processing module judges to there is whether consistent with the communication frame agreement data word string of data in buffer memory array Ai, is perform I step; Otherwise perform step L;
I. serial data receiving processing module clear Frame frame head mark Fi, by the buffer memory array Ai consistent with communication frame agreement stored in buffer memory array Bi, buffer memory array Ai subscript variable Ni resets, and performs step B;
J. serial data receiving processing module judges whether data are Frame frame head, are very then perform K step; Otherwise perform L step;
K. serial data receiving processing module judges to put Frame frame head mark Fi, and by reception buffer zone data assignment to buffer memory array Ai, buffer memory array Ai subscript variable Ni, from adding 1, performs step H;
L. buffer memory array Ai subscript variable Ni resets by serial data receiving processing module, performs step B.
Claims (10)
1. a serial asynchronous communication data transmission method, it is characterized in that comprising the steps: the host computer using host computer microcontroller chip as asynchronous serial communication, using slave computer microcontroller chip as the slave computer of asynchronous serial communication, the two connects to form serial asynchronous communication data transmission device by RS-232/RS-422/RS485 interface and TTL/ rs 232 serial interface signal change-over circuit, and arrange with serial data receiving processing module in host computer and slave computer microcontroller chip, the serial asynchronous communication data distributing program software of serial data sending module and timer T module composition, in the transmission of serial asynchronous communication data, host computer and slave computer periodic duty moment point, all with pair time rising edge of a pulse moment point for benchmark, serial asynchronous communication data distributing program software is according to workflow demand, buffer zone time-sharing send serial data frame information is sent to host computer and slave computer, slave computer and host computer is issued by TTL/ rs 232 serial interface signal modular converter, after host computer and slave computer reception buffer zone receive serial data frame information, serial data receiving processing module judges that whether the serial data frame information that host computer and slave computer reception buffer zone receive is effective, reception buffer zone assignment will be passed through to buffer memory array Ai for genuine Frame, buffer memory array Ai subscript variable Ni is from adding 1, the array word string consistent with communication frame agreement stored in buffer memory array Bi.
2. serial asynchronous communication data transmission method as claimed in claim 1, it is characterized in that: serial asynchronous communication data transmission method as claimed in claim 1, it is characterized in that: host computer microcontroller chip by TTL/ rs 232 serial interface signal change-over circuit and send pair time pulse cable, to slave computer microcontroller chip send pair time pulse.
3. serial asynchronous communication data transmission method as claimed in claim 1, it is characterized in that: during host computer pair pulse generation module produce a fixed cycle be Time hardware pulse signal as pair time signal, pulse receiving processing module when passing to slave computer microcontroller chip pair.
4. serial asynchronous communication data transmission method as claimed in claim 1, it is characterized in that: according to electronic system workflow, formulate host computer, communication frame agreement between slave computer, select the hardware pulse signal of a fixed cycle Time as pair time signal, agreement host computer microcontroller chip, slave computer microcontroller chip periodicity operation time point all with pair time rising edge of a pulse moment point for benchmark, and according to workflow demand time-sharing send data, send serial data moment point respectively at moment interval Time1 ~ Time2, Time3 ~ Time4 sends serial data.
5. serial asynchronous communication data transmission method as claimed in claim 1, it is characterized in that: host computer and slave computer are according to the largest interval time between transmission data frame data two data, determine to receive separately the largest interval time of continuous 2 Frames in communication data frame, as timer T1, T2 timing Ti1, Ti2 of host computer and slave computer, Ti1, Ti2 get Time/2.
6. serial asynchronous communication data transmission method as claimed in claim 1, is characterized in that: after serial data receiver module reception buffer zone receives data, serial data receiving processing module start-up routine.
7. serial asynchronous communication data transmission method as claimed in claim 1, is characterized in that: it is effectively no that serial data receiving processing module judges that reception buffer zone receives data, effectively then arranges timer T, timing Ti, open timer T and start timing.
8. serial asynchronous communication data transmission method as claimed in claim 1, it is characterized in that: serial data receiving processing module judges timer T timing time, if the serial data time-out received very then is described, do not meet workflow agreement, then buffer memory array Ai subscript variable Ni resets.
9. serial asynchronous communication data transmission method as claimed in claim 1, is characterized in that: reception buffer zone data assignment is added 1 to serial data receiving processing module buffer memory array Ai, buffer memory array Ai subscript variable Ni by serial data receiving processing module certainly.
10. serial asynchronous communication data transmission method as claimed in claim 1, it is characterized in that: serial data receiving processing module judges to there is whether consistent with the communication frame agreement data word string of data in buffer memory array Ai, then clear Frame frame head mark Fi, by the buffer memory array Ai consistent with communication frame agreement stored in buffer memory array Bi, buffer memory array Ai subscript variable Ni resets.
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| CN107783921A (en) * | 2016-08-29 | 2018-03-09 | 南京晨光集团有限责任公司 | The telecommunication circuits of highly reliable and low-cost multichannel RS 422 |
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